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Tiered networks were introduced in Cisco WAN Switching Software Release 8.0 as an alternative approach to building large networks. In a tiered network, you construct high-capacity node clusters at primary points of presence (POPs) and place smaller capacity nodes at secondary and tertiary POPs. Each node in a tiered network is identified as either a routing node or a feeder node.
Tiered network—hierarchical network
Feeder node—nonrouting node, feeder shelf, interface shelf
Used in tiered networks, a feeder node is a small switch that acts as an extension shelf, typically with lower-bandwidth interfaces, for a larger switch.
Feeder nodes are usually colocated with a routing node and are unaware of the presence of other nodes in the network. The routing nodes behave like any normal routing node, but they are also responsible for selecting routes for connections that terminate on the attached feeder nodes.
As an example, a number of IGXs can be designated as feeder nodes and connected to a colocated Cisco BPX 8600 series switch acting as a routing node in a large POP. Meanwhile, other IGXs or BPXs may act as routing nodes in smaller POPs. This allows a large, high-capacity network to be built without necessarily having a large number of routing nodes.
The IGX can be a feeder node to a BPX, another IGX, or certain MGX platforms. Because of the interdependence among the devices and the large-scale network management required in a tiered network, Cisco recommends that you use Cisco WAN Manager (CWM) to configure and manage the devices in the tiered network. This section describes how to enable and disable the feeder node functionality on the IGX.
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Note Refer to the release notes for each platform and software release that you plan to use in your tiered network for complete information on feeder functionality support, restrictions, requirements, and platform interdependencies. |
To enable IGX feeder functionality, complete the following steps:
Step 2 To activate the trunk interface that is connected to the routing node, enter the uptrk command.
Step 3 To configure trunk parameters, enter the cnftrk command.
To verify IGX feeder functionality, complete the following steps:
Step 2 To verify the trunk activation and parameter configurations, enter the dsptrks (display trunks) command or the dsptrkcnf (display trunk configuration) command.
To disable the IGX feeder functionality, complete the following steps:
Step 2 To tear down the trunk, enter the dntrk command.
Step 3 To disable the Interface Shelf function, enter the cnfswfunc command.
To verify that the IGX feeder node functionality is disabled, complete the following steps:
Step 2 To display the state of all trunks on the node, enter the dsptrks command.
Step 3 To verify that the Interface Shelf functionality is disabled, enter the dspswfunc command.
The IGX can be a feeder node to a BPX, another IGX, or an MGX. After enabling the IGX feeder functionality, you must configure the routing node to activate the feeder trunk interface, configure matching trunk parameters, and add the feeder node. Refer to the platform documentation for your routing node to add or delete a feeder node.
The IGX can serve as a routing node for the following feeders: IGX, IPX, Cisco MGX 8230, or Cisco MGX 8250. To configure the IGX as a routing node, refer to the section "Adding an Interface Shelf" in the chapter "Cisco IGX 8400 Series Nodes" of the Cisco IGX 8400 Series Provisioning Guide .
On Cisco.com:
Products & Services: Switches: Cisco IGX 8400 Series Switches: Configuration Basics Books:
Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later
On the Documentation CD-ROM:
Cisco Product Documentation: WAN Switches: IGX 8400 Series: Release 9.3.3:
Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later
If you are using Inverse Multiplexing over ATM (IMA), refer to the following sections:
On Cisco.com:
Products & Services: Switches: Cisco IGX 8400 Series Switches: Instructions and Guides: Configuration Basics Books: Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later
On the Documentation CD-ROM:
Cisco Product Documentation: WAN Switches: IGX 8400 Series: Release 9.3.3:
Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later
Products & Services: Switches: Cisco IGX 8400 Series Switches: Instructions and Guides: Installation Guides Books: Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later
On the Documentation CD-ROM:
Cisco Product Documentation: WAN Switches: IGX 8400 Series: Release 9.3.3:
Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later
If the routing node is a BPX, refer to the chapter "Configuring Trunks and Adding Interface Shelves" of the Cisco BPX 8600 Series Installation and Configuration .
On Cisco.com:
Products & Services: Switches: Cisco BPX 8600 Series Switches: Instructions and Guides:
Installation Guides Books: Installation and Configuration
On the Documentation CD-ROM:
Cisco Product Documentation: WAN Switches: BPX 8600 Series: Release 9.3.3:
Installation and Configuration Guide
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Note Not all MGX platforms support the IGX feeder node. Refer to the MGX release notes and platform documentation to verify support for the IGX feeder node. |
If the routing node is an MGX, refer to the following sections in the chapter "AXSM Configuration Guide " of the AXSM Software Configuration Guide and Command Reference, Release 4:
Part 2 - NETWORKS: Tiered Networks
On Cisco.com:
Products & Services: Network Management: Cisco WAN Manager
On the Documentation CD-ROM:
Cisco Product Documentation: Network Management: Cisco WAN Manager
On Cisco.com:
Products & Services: WAN Switching Software and Firmware: platform Software: Instructions and Guides: Release Notes
On the Documentation CD-ROM:
Cisco Product Documentation: WAN Switches: platform: software-release
On Cisco.com:
Products & Services: Switches: MGX platform
On the Documentation CD-ROM:
Cisco Product Documentation: WAN Switches: MGX platform: software-release
On Cisco.com:
Products & Services: Switches: Cisco BPX 8600 Series Switches
On the Documentation CD-ROM:
Cisco Product Documentation: WAN Switches: BPX 8600 Series
On Cisco.com:
Products & Services: Switches: Cisco IGX 8400 Series Switches
On the Documentation CD-ROM:
Cisco Product Documentation: WAN Switches: IGX 8400 Series
Posted: Mon May 12 15:37:25 PDT 2003
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